| /* |
| * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| */ |
| #include "lwip/opt.h" |
| |
| #if LWIP_HAVE_LOOPIF |
| |
| #include "netif/loopif.h" |
| #include "lwip/mem.h" |
| |
| #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP) |
| #include "netif/tcpdump.h" |
| #endif /* LWIP_DEBUG && LWIP_TCPDUMP */ |
| |
| #include "lwip/tcp.h" |
| #include "lwip/ip.h" |
| |
| static void |
| loopif_input( void * arg ) |
| { |
| struct netif *netif = (struct netif *)( ((void **)arg)[ 0 ] ); |
| struct pbuf *r = (struct pbuf *)( ((void **)arg)[ 1 ] ); |
| |
| mem_free( arg ); |
| netif -> input( r, netif ); |
| } |
| |
| static err_t |
| loopif_output(struct netif *netif, struct pbuf *p, |
| struct ip_addr *ipaddr) |
| { |
| struct pbuf *q, *r; |
| u8_t *ptr; |
| void **arg; |
| |
| #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP) |
| tcpdump(p); |
| #endif /* LWIP_DEBUG && LWIP_TCPDUMP */ |
| |
| r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM); |
| if (r != NULL) { |
| ptr = r->payload; |
| |
| for(q = p; q != NULL; q = q->next) { |
| memcpy(ptr, q->payload, q->len); |
| ptr += q->len; |
| } |
| |
| arg = mem_malloc( sizeof( void *[2])); |
| if( NULL == arg ) { |
| return ERR_MEM; |
| } |
| |
| arg[0] = netif; |
| arg[1] = r; |
| /** |
| * workaround (patch #1779) to try to prevent bug #2595: |
| * When connecting to "localhost" with the loopif interface, |
| * tcp_output doesn't get the opportunity to finnish sending the |
| * segment before tcp_process gets it, resulting in tcp_process |
| * referencing pcb->unacked-> which still is NULL. |
| * |
| * TODO: Is there still a race condition here? Leon |
| */ |
| sys_timeout( 1, loopif_input, arg ); |
| |
| return ERR_OK; |
| } |
| return ERR_MEM; |
| } |
| |
| err_t |
| loopif_init(struct netif *netif) |
| { |
| netif->name[0] = 'l'; |
| netif->name[1] = 'o'; |
| #if 0 /** TODO: I think this should be enabled, or not? Leon */ |
| netif->input = loopif_input; |
| #endif |
| netif->output = loopif_output; |
| return ERR_OK; |
| } |
| |
| #endif /* LWIP_HAVE_LOOPIF */ |
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